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HARWOOD & NEWTON.

. Stove Grate. No. 86,069. A Patented June 19, 1869.

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LUTHER- w. HARWOOD AND CHARLES. D. NE TON, or TROY, NEW YORK, ASSIGNORS TO ELIH'U nosnonn, on CHICAGO, ILLINOIS.

Letters Patent No. 86,069, dated Janua/rg 19, 1869.

PLATE on G-RATE ron BASE-BURNING- s-rovna The Schedule referred to in these Letters Patent and making part ofthe same.

fication, in which a vertical central section of our improved grate is shown.

Our invention relates to stores having adownward draught, and is an improvement upon the grate invented by Elihu Hosi'ord, and secured to him by Letters Patent No. 80,484; and

It consists in the means employed for conducting the current of cold air to the under side of saidgrate, and compelling it to pass beneath, and cool its entire surface; after which, said air is permitted to escape, and mingle with the downward current of gas from the fuel-chamber, and assist in the process of combustion.

In the annexed drawing- A represents the grate, consisting of a circular plate or disk of metal, made convex upon its upper side, and resting, by means of lugs, upon another, plate or disk, B, corresponding in shape and size with said grate.

The lugs c a are reduced in thickness, for about onehalf inch from their lower ends, forming a shoulder upon opposite sides, and slots are provided inthe disk B, into which the thin ends of said lugs are inserted, the shoulders resting upon the disk, so as to hold said grate and disk apart, and leave a space for the passage of the air.

Upon the lower side of, the disk B is a huh, I), in which is provided a recess for the reception of the end of a hollow column, 0, supporting said-disk and grate.

Through the centre of the disk is an opening, corresponding insizeto the interior of the column 0, forming, in combination with said column, a flue, through which a-current of cold air canfreely pass upward, beneath the grate.

It will be readily seen that, by the addition of the disk B, the cold air is compelled to pass beneath, and cool the entire grate before being liberated, and that, after having performed such olfice, said air is brought in contact with the descending column of heated gas from the fuel, at the instant that said gas leaves the fuel-chamber, by which means a more thorough union of the gas and air takes place than could otherwise be efiected, and more perfect combustion 'is insured.

Having thus fully set forth the nature and merits of our invention,

What. we claim as new, and desire'to secure by Letters Patent,- is- The disk B, or its equivalent, arranged immediatelyj tire fuel-s upportin g plate, substantially as herein shown and described.

In testimony that we claim the foregoing, we have hereunto set our hands, this 2d day of January, 1869.

LUTHER W. HARWOOD.

Witnesses: CHARLES D. NEWTON.

ROBERT H. WELLS, J. S. W. FULLER, 

